Open AccessDeterminations of wave-length from spectra obtained at the total solar eclipses of 1900, 1901 and 1905
Author(s) -
Frank Watson Dyson
Publication year - 1906
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1906.0075
Subject(s) - chromosphere , spectral line , greenwich , eclipse , physics , solar eclipse , observatory , astrophysics , astronomy , geology , soil science
This paper gives the wave-lengths deduced from measures of a number of photographs of the chromosphere and corona obtained in three eclipse expeditions from the Royal Observatory, Greenwich. The spectra extend from wave-length 3300 to 5875. Nearly all the brighter lines of the chromosphere are identified with practical certainty, the observed wave-length differing in very few cases by 0.1 tenth-metre from the line with which it is identified. The identification was principally made by comparison with the spark spectra of Exner and Haschek, Sir Norman Lockyer’s results being used for “enhanced” lines. For comparison, the intensities of the corresponding lines in the spark, arc, and solar spectra are given, obtained from various published sources.